Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97f386aa518275e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-11 15:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea7fbcdff61f4fea57b14eccc163a3b7 SHA-1: d009bb9711f925ac1dc032e39794719b7593e640 SHA-256: c97f386aa518275ee04536b107cd46f61eceb2b3d8f273ba65a1dedca34abf12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The presence of 'utm_term' in URLs suggests a phishing or SEO manipulation attempt to lure users into downloading potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=age+of+empires+apk+free+download PDF link annotation
    • http://hz-karavany.cz/ckfinder/userfiles/files/94402584902.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/daradukusefufiwopopaz.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210909_1581A631861E1D93.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/12161738738.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/74304376641.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/kobesinanugobukituwo.pdfIn PDF document text
    • https://nistd.in/userfiles/file/fimazoko.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/dufiloxodivegusotosotes.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c080dd2886---belemaravusadaruzi.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/dekifirotubokamev.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/mikopimiwenujo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9a3091bae45a6773254b64f3de709f5f/24335540307.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/54746916825.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d844d194---66038369837.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/34753760374.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/22529780927.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/12835300663.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109020617513341.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zoxuzamu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138542b8c8e6---70626431343.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/wirumugarutudagisulufuxi.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fc26489571002938865dc52b926a4344/bifatudugupizaginozin.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381993cd724---77649089116.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8E 10904 bytes
SHA-256: 498236cddd2e0976b1f1eba72c9c3632ce7c4a13df147d2ccd1ada92b30d8cbc
font_01_sfnt_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 17016 bytes
SHA-256: c5d7c902a43fa12fe2dcf7e08d1eb21d0e9f7f12cdd821dad466d3554955b180